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公开(公告)号：US3648171A
公开(公告)日：1972-03-07
申请号：US3648171D
申请日：1970-05-04
Applicant: BELL TELEPHONE LABOR INC
Inventor： HIRSCH DONALD
CPC classification number: H04L25/03031
Abstract: The automatic time-domain equalizer is modified to improve its signal-to-noise and impulse-response dispersal performance by supplementing the basic prior art equalizer with a final equalizer whose tap attenuators are controlled by correlations of the output of the basic equalizer with a distortion error signal. The reference input to the final equalizer is the appropriately delayed signal to be equalized. Two cascade equalization sections substantially eliminate from the final output the noise and echo components that are normally generated in the basic equalizer when used alone.
Abstract translation: 修改自动时域均衡器以通过用最终均衡器补充基本现有技术的均衡器来改善其信噪比和脉冲响应分散性能，其最终均衡器的抽头衰减器由基本均衡器的输出与失真的相关控制 误差信号。 到最终均衡器的参考输入是要被均衡的适当延迟的信号。 两个级联均衡部分基本上从最终输出消除了当单独使用时通常在基本均衡器中产生的噪声和回波分量。
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Patent Agency Ranking2.发明授权
公开(公告)号：US3529143A
公开(公告)日：1970-09-15
申请号：US3529143D
申请日：1968-05-13
Applicant: BELL TELEPHONE LABOR INC
Inventor： HIRSCH DONALD
CPC classification number: H04L25/03133 , G06G7/161 , H03H21/0001
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3.发明授权Timing recovery system in which an equalizer{40 s sampling time is set in response to the difference between the actual mean square error and a predetermined acceptable error 失效定时恢复系统，其平均值（40秒采样时间是针对实际平均误差与预测的可接受错误之间的差异设定的）
公开(公告)号：US3617635A
公开(公告)日：1971-11-02
申请号：US3617635D
申请日：1970-05-15
Applicant: BELL TELEPHONE LABOR INC
Inventor： HIRSCH DONALD , MEADORS HOWARD CLARENCE JR
CPC classification number: H04L7/0062 , H04L25/03038
Abstract: A system is disclosed in which an error signal used for adjusting tap weights in a time domain equalizer is integrated in an up-down counter over one-half of an interval. At the end of the first one-half of the interval, the count in the counter is decreased by a predetermined amount proportional to a minimum acceptable error level. The count in the counter is then reduced at a predetermined rate until the count in the counter is zero. During the time the count is being reduced at the predetermined rate, the sampling time of a signal applied to the equalizer is phase shifted in a direction determined by the difference between the integrated error in the present and preceding intervals.
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4.发明授权System for generating initial settings for an automatic transversal equalizer 失效用于生成自动横向均衡器的初始设置的系统
公开(公告)号：US3629736A
公开(公告)日：1971-12-21
申请号：US3629736D
申请日：1970-10-02
Applicant: BELL TELEPHONE LABOR INC
Inventor： HIRSCH DONALD , MEADORS HOWARD CLARENCE JR
CPC classification number: H04L25/03038
Abstract: In a transversal equalizer with tap multipliers whose settings are automatically controlled by the mean-square error difference between a predetermined transmitted work pattern and a receivergenerated identical pattern, an improvement in startup performance in the presence of high-level distortion is achieved by making incremental phase changes in the receiver timing on each failure of comparison between the two patterns. Further improvement is effected by resetting all tap multipliers, except a reference multiplier, to the zero condition when such comparison failures persist. Upon repeated failure for a predetermined number of occurrences the state of the receiver word generator is altered to conform to the most recently received segment of the transmitted work pattern thus attaining timing synchronization and initial equalizer adjustment simultaneously.
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5.发明授权
公开(公告)号：US3573668A
公开(公告)日：1971-04-06
申请号：US3573668D
申请日：1968-12-05
Applicant: BELL TELEPHONE LABOR INC
Inventor： BENDER EDWARD C , HIRSCH DONALD , RUDIN HARRY R JR
CPC classification number: H04L25/03038
Abstract: The automatic transversal filter equalizer is modified for improved startup performance in the presence of high initial distortion by providing control signals for adaptive adjustment of tap multipliers from correlations of the polarity of unequalized received data samples, rather than the polarity of data samples in the equalizer output, with the polarity of an error component in the equalizer output.
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公开(公告)号：US3529089A
公开(公告)日：1970-09-15
申请号：US3529089D
申请日：1968-08-28
Applicant: BELL TELEPHONE LABOR INC
Inventor： DAVIS CLAUDE G , HIRSCH DONALD
CPC classification number: H04Q11/04
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